I suggest you set a custom attribute to the pageview which should indicate whether the user control inside it is loaded for a first time, the attribute can be set when the pageview is created:
RadPageView pageView =
pageView.ID = pageViewID;
I guess that the user control is loaded in PageViewCreated event handler.
Here is the Page_Load event of the user control which checks the "loadedUC" attribute:
sender, EventArgs e)
RadPageView parentPageView = (RadPageView)
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